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Posts Tagged ‘Science’

2024 YR4

Tom Maunder brought this to my attention:

It may sound apocalyptic, but a newly detected asteroid nearly the size of a football field now has a greater than one percent chance of colliding with Earth in about eight years.

Per CNN, the risk has increased:

“…the asteroid has a 2.2% chance of hitting our planet on December 22, 2032, according to the European Space Agency. The risk assessment has increased from a chance of 1.2% over the last week due to new observations.”

Tom Maunder’s assessment in response to my comment about a SpaceX deflection mission:

Deflection could be possible.  Right now they don’t know as much about the trajectory/orbit as they need to.  This rock was just discovered at Christmas and it is presently heading outbound on its orbit.  They are scouring past “sky photos” to see if it might have been imaged before but so far, no luck there. 

It will only be visible through April, then its out of sight for a couple of years.  Hopefully they will have enough info to forecast the orbit and determine that it will come close to earth but not impact.  They went through that exercise with Apothis which will miss earth by about 15000 miles on Friday, April 13, 2029.  That is closer than the geosynchronous communication satellites at 23000 miles.”

I suspect if an impact cannot be ruled out before it disappears that plans will be made to send a recon mission when it next approaches earth in 2028.

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“The 4776-meter-tall Pao Pao Seamount (right) in the South Pacific Ocean has been mapped by sonar. Many others haven’t.” NOAA OFFICE OF OCEAN EXPLORATION AND RESEARCH

This Science article underscores how little we know about the oceans.

With only one-quarter of the sea floor mapped with sonar, it is impossible to know how many seamounts exist. But radar satellites that measure ocean height can also find them, by looking for subtle signs of seawater mounding above a hidden seamount, tugged by its gravity. A 2011 census using the method found more than 24,000. High-resolution radar data have now added more than 19,000 new ones. The vast majority—more than 27,000—remain uncharted by sonar. “It’s just mind boggling,” says David Sandwell, a marine geophysicist at the Scripps Institution of Oceanography, who helped lead the work.

Besides posing navigational hazards, the mountains harbor rare-earth minerals that make them commercial targets for deep-sea miners. Their size and distribution hold clues to plate tectonics and magmatism. They are crucial oases for marine life. And they are pot-stirrers that help control the large-scale ocean flows responsible for sequestering vast amounts of heat and carbon dioxide, says John Lowell, chief hydrographer of the National Geospatial-Intelligence Agency (NGA), which runs the U.S. military’s satellite mapping efforts.

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